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Q: What is the radius if the diameter is 18cm?

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9 cm (r = d/2)

The diameter is always double the radius so in this case, it is 18cm

18cm is about 7 inches

1,017.9 cm2

Using 3.14 as Pi the area of circle is: 1017.36

A = 254.47 cm2

The general equation for the area of a circle is π*r2, where r is the radius of the circle, and π is pi, which is approximately 3.14159. The diameter of a circle is how far it is from one side of the circle to the other, and the radius is how far it is the from edge to the center, thus the radius is half the diameter. Therefore the area is π*(92) ~ 254.47

Radius = Diameter/2 Diameter = 2* Radius

18 pi cm

190kg

radius = diameter/2

to get the diameter from the radius you simply multiply the radius by 2 since the radius is half the diameter. d=2r where d = diameter and r = radius

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